Take my number off of your system!

I am absolutely tired of this company calling me every single day at least 3-5 times a day for the last 3 months!! I keep telling them I am not the person they are asking for and neither have I every heard of this person, I keep asking them to take my number off of their system and they say that they do, few minutes later I receive the same freaking call again! I have called them directly to ask to remove my number and have sent email after email and nothing gets done about it! This is ridiculous!